Define dedicated error types for `HandleOrNull` and `HandleOrInvalid`

sunfishcode / io-lifetimes

A low-level I/O ownership and borrowing library

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Closed sunfishcode closed 2 years ago

sunfishcode commented 2 years ago

Introduce the InvalidHandleError and NullHandleError error types, corresponding to rust-lang/rust#95387.

sunfishcode commented 2 years ago

This has now landed on Right nightly.